[Discuss-gnuradio] Simple question

[Gary.Simpkins]

Hi All

I have completed a few online examples and my own simple projects with 
GNURadio3.7.13.4 and have started on the main project. However I seem to 
have fallen at the first fence.

The project is to connect the two virtual soundcard outputs from my RSP 
SDRDuo, running SDRUno software which is super for setting all the SDR 
params I need into MAP65. The soundcard outputs use left stereo channel 
for" "I and right  for "Q" , and if connected to MAP65 soundcard 
interface (one at a time) they work well. However it does not seem 
possible to connect two sound cards through the soundcard option into 
MAP65. The only other option is to use the UDP connection.  My project 
is to get these two soundcard inputs to a UDP output.

I fell at the first fence because no matter what I have tried I cannot 
get the audio source on GNURadio to allow me to use a second output for 
the second stereo channel.

I even stripped the design down to the audio source and two QT GUI 
Frequency sinks. with the audio source set to one channel and connected 
to both sinks it compiles and runs fine, but as soon as I enable the 
second port for stereo I get the error below :-

Executing: C:\GNURadio-3.7\gr-python27\python.exe -u 
C:\Users\Gary\Documents\top_block.py

INFO: Audio source arch: windows
INFO: Audio sink arch: windows
INFO: Audio sink arch: windows
Traceback (most recent call last):
  File "C:\Users\Gary\Documents\top_block.py", line 109, in <module>
    main()
  File "C:\Users\Gary\Documents\top_block.py", line 97, in main
    tb = top_block_cls()
  File "C:\Users\Gary\Documents\top_block.py", line 75, in __init__
    self.connect((self.audio_source_0, 1), (self.audio_sink_1, 0))
  File "C:\GNURadio-3.7\lib\site-packages\gnuradio\gr\hier_block2.py", 
line 47, in wrapped
    func(self, src, src_port, dst, dst_port)
  File "C:\GNURadio-3.7\lib\site-packages\gnuradio\gr\hier_block2.py", 
line 110, in connect
    self.primitive_connect(*args)
  File "C:\GNURadio-3.7\lib\site-packages\gnuradio\gr\runtime_swig.py", 
line 5312, in primitive_connect
    return _runtime_swig.top_block_sptr_primitive_connect(self, *args)
ValueError: port number 1 exceeds max of 0

>>> Done

If anyone can explain what I am doing wrong I would be very grateful.

Sorry to ask such a simple question but I have searched the web for a 
solution and not found one.

Regards

Gary